[Rpm-maint] [rpm-software-management/rpm] Cannot set Build Date from changelog anymore (#932)

[Bernhard M. Wiedemann]

This is a regression over 4.14.2
and not from #785 

I do set
```
%_buildhost reproducible
%source_date_epoch_from_changelog Y
%clamp_mtime_to_source_date_epoch Y
%use_source_date_epoch_as_buildtime Y
```

and I can see with `rpm -qpvl` that the file mtimes are correctly adjusted, but the Build Date header gets the current time with 4.15, where it got the changelog date with 4.14.2

I think commit fa303d5ba6bef5b4a44b884c6dadadc27b594caa broke setting `RPMTAG_BUILDTIME` from `SOURCE_DATE_EPOCH` when that is only parsed from the first changelog entry later.

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